ASI4U datasheet(21/71 Pages) RENESAS

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ASI4U / ASI4U-E / ASI4U-F Datasheet

January 26, 2016

3.4.

Master Mode

Master Mode and the related Repeater and Monitor Modes differ completely in their functional properties from the

Slave Mode. While the IC can autonomously perform different tasks in Slave Mode, it will only act as a physical

layer transceiver in the Master, Repeater, and Monitor Modes.

The basic property of these modes is a modulation/demodulation of AS-i signals to Manchester-II code and vice

versa. The following figure shows the different data path configurations.

Figure 3.4

Data Path in the Master, Repeater, and Monitor Modes

Master Mode

Slave Mode, AS-i Channel

Slave Mode, IRD Addressing Channel

Master Mode, Repeater Mode, and Monitor Mode differ from each other in the kind of signals that are available at

the data I/O and parameter port pins of the IC. The signal assignments in Table 3.3 are provided:

Table 3.3

Signal Assignments for Data I/O and Parameter Port Pins

MASTER MODE

REPEATER MODE

MONITOR MODE

Receive Clock

Hi-Z

Receive Clock

Power Fail

Hi-Z

Power Fail

Receive Strobe – Slave Telegram

Hi-Z

Receive Strobe – Slave Telegram

Hi-Z

Receive Strobe – Master Telegram

DI0

Inverting of IRD input signal. If these two are on different levels, the IRD input signal is inverted before further

processing; otherwise it is directly forwarded to the UART.

DI1

DI2

Inverting of LED output signal. If these two inputs are on different levels, the LED output signal is inverted after

processing; otherwise it is directly forwarded to the LED1 output.

DI3

DO0

Hi-Z

Pulse Code Error

DO1

Hi-Z

No Information Error

DO2

Hi-Z

Parity Bit Error

DO3

Hi-Z

Manchester-II-Code Error at IRD Input

More detailed signal descriptions can be found in sections 4.6, 4.7, and 4.12.

ASI Receiver

ASI Transmitter

IRD CMOS

Input

LED Output

UART

ASI+

ASI-

IRD

(TX)

LED1

(RX)

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